<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <select id="mySelect">
      <option value="1">文本一</option>
      <option value="2">文本二</option>
      <option value="3">文本三</option>
    </select>
    <script src="./jquery.js"></script>
    <script>
        $('#mySelect').on('change',function(item,index){
            console.log(item,index,17);
            var text = $(this).find('option:selected').text()
            console.log(text,19);
            
            
        })
    </script>
  </body>
</html>
